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What 3 factors that affect the output of a generator?
1:The strenght of the main magnetic Field. Determined by the strenght of the field magnets in a permanent magnet machine, or by the number of turns of wire on the field coils and the current through the coils in a wound field machine.2: The number of armature conductors connected in series, which cut the main magnetic field. Determined by the number of turns on armature coils and weather the armature is lap or wave wound, which determines the number of armature conductors connected in series.3: The speed at which the armature conductors cut the main magnetic field. The faster the armature cuts the magnetic Field, the higher will be the value of the voltage generated in the machine
What is over excitation of field windings?
Over-excitation of field windings refers to a condition in synchronous machines, such as generators, where the field current exceeds the rated value, leading to an excessive magnetic field. This can result in increased voltage output and potential overheating of the machine. Prolonged over-excitation can damage the windings and other components due to overheating and insulation breakdown. It is critical to monitor and control the excitation levels to maintain safe and efficient operation.
What is meant by excitation of synchronous machines?
Excitation of synchronous machines refers to the process of supplying direct current (DC) to the rotor winding to create a magnetic field, which is essential for the operation of the machine. This magnetic field interacts with the rotating magnetic field produced by the stator, enabling the machine to generate or synchronize with the grid frequency. Proper excitation is crucial for maintaining voltage levels and ensuring stable operation under varying load conditions. Inadequate or excessive excitation can lead to issues such as voltage instability or oscillations.
What is excitation of DC machine?
In general terms, 'excitation' simply describes the process by which an electric current produces a magnetic field. But, more specifically, it refers to the creation of the magnetic field by the field windings of a motor or generator. In the case of an alternator, for example, the armature windings (the windings into which voltages are induced) are stationary, and inserted into slots cut into the inner face of the stator. The field is then provided by the rotor which is supplied (via slip rings) with a 'excitation' current provided by an external d.c. voltage.
What is the effect of a increasing the excitation current?
Increasing the excitation current in an electrical machine, such as a generator or motor, typically raises the magnetic field strength. This can lead to an increase in output voltage for generators or enhance the torque and performance in motors. However, excessive excitation can cause saturation of the magnetic core, leading to diminished returns and potential overheating. Proper management of excitation current is essential for optimal machine performance and longevity.
How generator operates?
It works with two reactor coils for excitation of the field reactor coil , which in turn provides current to the field. The two reactor coils are connected in shunt and series with the output of the generator stator or armature ( from where load is connected).
How can the field coils of DC machines be connected with self excited machines?
No
What is inductor alternator?
The armature and the field windings of an inductor alternator are both accommodated in the stator. The three phase ac armature windings are distributed in small slots and the dc field windings are concentrated in two slots in the stator. Each field coil spans half the total number of stator slots. Armature coils are connected in star and field coils are connected in series. The rotor resembles a cogged wheel, with no winding. The core of the stator, which is completely embraced by the field coils, will retain a residual magnetism if excited once. When the rotor is rotated, the passage of the rotor teeth alternatively under the field offers a varying reluctance path for the flux produced by the field coils. This flux, which varies periodically, links with the armature coils and induces an emf in them. The frequency of the induced emf depends on the speed of the rotor. The magnitude depends on the speed of the rotor as well as on the level of excitation. The armature and the field windings of an inductor alternator are both accommodated in the stator. The three phase ac armature windings are distributed in small slots and the dc field windings are concentrated in two slots in the stator. Each field coil spans half the total number of stator slots. Armature coils are connected in star and field coils are connected in series. The rotor resembles a cogged wheel, with no winding. The core of the stator, which is completely embraced by the field coils, will retain a residual magnetism if excited once. When the rotor is rotated, the passage of the rotor teeth alternatively under the field offers a varying reluctance path for the flux produced by the field coils. This flux, which varies periodically, links with the armature coils and induces an emf in them. The frequency of the induced emf depends on the speed of the rotor. The magnitude depends on the speed of the rotor as well as on the level of excitation.
What 3 factors that affect the output of a generator?
1:The strenght of the main magnetic Field. Determined by the strenght of the field magnets in a permanent magnet machine, or by the number of turns of wire on the field coils and the current through the coils in a wound field machine.2: The number of armature conductors connected in series, which cut the main magnetic field. Determined by the number of turns on armature coils and weather the armature is lap or wave wound, which determines the number of armature conductors connected in series.3: The speed at which the armature conductors cut the main magnetic field. The faster the armature cuts the magnetic Field, the higher will be the value of the voltage generated in the machine
What is over excitation of field windings?
Over-excitation of field windings refers to a condition in synchronous machines, such as generators, where the field current exceeds the rated value, leading to an excessive magnetic field. This can result in increased voltage output and potential overheating of the machine. Prolonged over-excitation can damage the windings and other components due to overheating and insulation breakdown. It is critical to monitor and control the excitation levels to maintain safe and efficient operation.
What is meant by excitation of synchronous machines?
Excitation of synchronous machines refers to the process of supplying direct current (DC) to the rotor winding to create a magnetic field, which is essential for the operation of the machine. This magnetic field interacts with the rotating magnetic field produced by the stator, enabling the machine to generate or synchronize with the grid frequency. Proper excitation is crucial for maintaining voltage levels and ensuring stable operation under varying load conditions. Inadequate or excessive excitation can lead to issues such as voltage instability or oscillations.
What is excitation of DC machine?
In general terms, 'excitation' simply describes the process by which an electric current produces a magnetic field. But, more specifically, it refers to the creation of the magnetic field by the field windings of a motor or generator. In the case of an alternator, for example, the armature windings (the windings into which voltages are induced) are stationary, and inserted into slots cut into the inner face of the stator. The field is then provided by the rotor which is supplied (via slip rings) with a 'excitation' current provided by an external d.c. voltage.
What is meant by static excitation?
Static excitation refers to a method of supplying direct current (DC) to the rotor windings of a synchronous machine, such as a generator, to establish a magnetic field. This excitation is "static" because it typically involves the use of a stationary power source, like a rectifier, to convert AC voltage from the generator into DC. The static excitation system allows for precise control of the machine's output voltage and reactive power, enhancing stability and performance. It contrasts with dynamic excitation systems, which use rotating equipment to provide excitation.
What is the effect of a increasing the excitation current?
Increasing the excitation current in an electrical machine, such as a generator or motor, typically raises the magnetic field strength. This can lead to an increase in output voltage for generators or enhance the torque and performance in motors. However, excessive excitation can cause saturation of the magnetic core, leading to diminished returns and potential overheating. Proper management of excitation current is essential for optimal machine performance and longevity.
If the dc excitation is reduced will the apparent power increase or decrease?
If the DC excitation is reduced in a synchronous machine, the apparent power will generally decrease. This is because the reduction in excitation leads to a lower magnetic field strength, which can cause a decrease in the machine's ability to produce reactive power. As a result, the overall apparent power, which is the combination of real and reactive power, will also decline.
What is cross field principle?
A seperately excitd 2pole dc generator consitstng of many cnoductors rotating in magneti2 field producd by field coils with no load connected to it
If a magnet is put inside one coil of wire a voltage is produced. What will happen if the magnet is put inside two coils of wire?
I would expect a voltage in both coils of wire.Note that, if the two coils are connected, the voltages (and corresponding currents) in the coils can interact. Also, if the two coils are NOT connected, they can STILL interact, since a current will produce its own magnetic field.
